Sprayer for residential lawns to look at is Proedge PE-CW that can be seen at proedgesprayers.com. Unit is very maneuverable around trees with front mount 120" boom and zero-turn function. 25 gal. tank will spray one acre in 15 minutes at comfortable 2.5mph walking speed. Unit gives very good drift control and has edge curtain for sensitive areas if desired. Current cost of unit is $3,995 including SnapperPro power unit--edge curtain optional plus tax & freight. Unit has proven track record with applicators here.